I have the Panasonic 14-45mm and the 45-200mm.
Both work fine. AF is slow but it's slow on any AF lens really. I would not rely on AF when shooting video anyway.
Manual focus can tricky as the focus rings have a short throw and, like most modern AF lenses, have no hard stops.
Image quality is ok. I think the 14-45mm is a perfect starter lens for outdoor use on the BMPCC.